Window grille installation block



FIG. 1 is a top front isometric view of a window grille installationblock;

FIG. 2 is a bottom rear isometric view thereof;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a rear elevation view thereof;

FIG. 5 is a left elevation view thereof;

FIG. 6 is a right elevation thereof;

FIG. 7 is a top view thereof; and,

FIG. 8 is a bottom view thereof.

CLAIM The ornamental design for a window grille installation block, asshown and described.